Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b8b43b9afc7bfb…

MALICIOUS

PDF

101.8 KB Created: 2021-07-05 19:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6bebfda2cbc439d7395a6f596487fb5c SHA-1: d07ecb073fb4b7ff07e37685070452cedb96de9b SHA-256: c5b8b43b9afc7bfb933e6666bd48a5cc75458ed14243cb62250c8dc2fd6ae547
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common tactic for distributing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=such+thing+as PDF link annotation
    • http://tidaksusah.com/contents//files/kozizujopipomenesexet.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/c089750cd5ad5f663de02e74d306fa2d/21583844565.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/26e059c71e0c7b9105cc00400140f8ca/66946298676.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/bowovim.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/oie8jm026nr32blukffeu9s1l2/22508512359.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c10941400---naluta.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/cb7i38nhv36vd3j7t04vuijrv0/kupikesozuwotuvol.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160718ad43a4bb---23051357810.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/6d59bv0ip3fo1esh3qc87v69e2/98081139810.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/o93invcf8h5s51lrvvnplu5se2/volisalimipiluwewi.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/62120277662.pdfIn PDF document text
    • https://haidangpc.com/contents/files/bisamidoguj.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/rivewuno.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/92275848872.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607998c73cb8e---10876076395.pdfIn PDF document text
    • http://redactron.com/userfiles/file/21544583755.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/q4e06b7t45heffiab2gd7c501k/rovifarebilewevaxisok.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/e78306cc10d7fc09ff7f6dc594673f7b/76356105560.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe03759d0---20916419949.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/pc15nf7ujebrbtga7ma5v33csn/zonefasezesatezenoge.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/xobinen.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090e5b7a4c29---45031659389.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCF 17344 bytes
SHA-256: 3fdd75d609883b1e6556fb20e90d94a9b4456725d0d14081a16d15deb7d01be0
font_01_sfnt_off00015b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B2A 10288 bytes
SHA-256: 56c32123488b2960ba25b400cd7f20028480ede217267723dd9a3ac247756867
font_02_sfnt_off0001723f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1723F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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